Construction of steam-boilers.



A. W. METGALFE & J. S. D. SHANKS.

CONSTRUCTION OF STEAM BOILERS.

Anmou'lou 1-11.21) 1113.18. 1905.

907,841 Patented Dec. 29, 1908.

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1 MM' afM A. W. ME'I'GALFE & J. S'. D. SHARKS. UONSTRUGTION OF'STEAMBOILERS. APPLIOATION FILED PEBTIB, 1905.

907,841 Patented Dec. 29, 1908.

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GONSTRUOTION 0P STEAM BOILERS. APPLICATIOK FILED IEBI. 18, 1906.

907,841 I Patented Dec.29, 1908..

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WITNESSES.

A. W. METOALFE & J. s. .D. SHANKS. UONSTRUG'IION OF STEAM BOILERS.APFLIOATIOH FILED FEB. 13, 1905.

907,841 i I I v Patented Dec. 29, 1908.

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UNITEDHSTATES ARTHUR W. METcALFEnND ioHN 'sT EL ixon siiiinxs, on'BELFAsT', iRELAnn. i

o sm emnjosg ainoasts? Q To allwhom itmayjconcern: j

Be it known that we,'"ARTH R WILSON METOALFE and JOHN STEELDIXONQSHANKS, British subjects. and residents of Belfast,

county of Antrim, Ireland, have invented certain new and usefulImprovements in the construction of Steam-Boilers} of which thefollowing is aspecification. X

This invention relates to tubular "boilersthe expansion and contractionof'the tubes.

Our invention consists'essentially in constructing the tubes in sets orgroups or nests' o fitted into suitable coupling'plates'at both ends bywhich they are fitted to =the' boiler plates each unit so constructedcontaining any desired number of tubes sayfroni 12 up to 100 more orless according to thesize of 5 the boiler and the'size of the unitsorsets of tubes.

The invention will be fully describedwith reference to theaccompanying'drawings in which as examples theinventionis shown appliedto various descriptions of boilers some of which have been speciallydesigned for the purpose. I

Figure 1 is a sectional elevationof a vertical boiler showing theinvention "applied 5 thereto. Fig. 2 is a sectional plan of same.

Fig. 3 is a sectional elevation of special; design of vertical boilerwith the nests or units of tubes applied thereto. -Fig.f4 is a sectionalplan of same showingthe positionof the nests of tubes. Fig. 5 is asectional elevation of one unit or set of tubes with the coupling forfastening same into the' plates of the boiler. Fig. 6 is a half plan ofthe coupling plate into which the set or nest of tubes is fixed. Fig. 7is a sectional elevation of one unit or set of tubes showing a modifiedconstruction of cou ling plates. Fig. 8 is a half plan of same. ig. 9 isan elevation of water tube boiler constructed with units of tubes withinlarger water tubes. Fig. 10 is an end elevation of same showing spacingof tubes and units. Fig. 11 is a sectional elevation of special designof locomotive boiler constructed with both horizontal and vertical nestsof tubes. Fig. 12 is a half end 'Speeificati on'of pette'i-cs at aaf?meatede eefleosf; Application fl ledlebruary 18, 1905.; Serial 4 NB.246,348. I

ev ion section through' '13 isaplanf; I

- "lheinvention"may1beappliedto any ordinary formof tubular-or watertube boilers either vertical or horizontalthe tubes being f groupedtogether in nests or sets D the ends being fitted into coupling plates Ato attach themto the plates of the boiler each nest or 'set formingaunit ofjtubes D which can be handled and-'easily and readily placed inposition orremoved therefrom. E 1

The coupling plate A is preferably in the form of-adish-shaped metalliccasting or forging into which the 'tubes-aresecured'in any ordinary wayby "drifting or expanding" 1 by screwingor by nuts or in anyother-manner'. 'lhe inner wall jw' is chased or screwedto receive an annularnut' B (see "Fig. 5) and the outer edge a/ is beveledas is also the edgeof the annular nut. 1 steam and water tight joint "between the couplingplates A- and a corresponding hole in'the boiler plates A is obtained bya metallic or otherpacking ring G placed in the-hole in the boilerplateand 'interposed between the conical orbeveled edge at of thecoupling plate and the beveled or conical edge b] of the annular-nutB.I:

{- The metallic packing ring is preferably soft copper andwhen theannular nutBis" *screwed into the. couplingflplateA the ring Cisfexpanded between the two beveled faces 3 making "steam or water tight1 joint with the hole in'the plate'A"; Thepacking ring G can move in thehole in the plate A asthetubes D contractor expand.

To insert and'fix the unit of tubes inpo- *sition the hole in one plateA"is preferably Y made larger than that the other and one coupling A'is'made. with a shoulder to rest against the plate and the nut is also 5madefwith ashoulder to limitth'e movement at the tubes. If desired bothnuts- B may *have'a shoulder suchas b. r The coupling is passed throughthe larger hole and secured in the smaller one with the shoulder aresting against the lat-e and the other coupling is then secured in thehole in the other plate through which it has passed by screwing the nutB down u on the packing ring 0.

In a modi' cation shown in Fig. 7, the dished coupling plate A at oneend of the unit of tubes D is drawn down onto a soft .metallic packingring 0 by the annular nut formed with a shoulder or head 12 which restsagainst the plate A, and coupling plate A at the other end is providedwith screwed studs or bolts a by which a metallic packing ring C isclamped between it and a plate or cover A and expanded against the sidesof the hole in the plate A. It will be evident that the soft metallicpacking ring C may be clamped and expanded between the coupling plate Aand the sides of the hole in the plate by any other suitable means.

Referring to I igs. 1 and 2 the unit of tubes D are shown attached bythe coupling plates A to the top and bottom horizontal plates A of acylindrical vertical multitubular boiler. The horizontal plates A areriveted to the cylinder at the top and bottom and are supported by staysor stay tubes E of ordinary construction expanded into or otherwiseattached to the plates. A fire grate L is placed below the boiler asdescribed and a smoke box may be placed above the tubes.

Referring to Figs. 3 and 4 another special construction of boiler isshown for utilizing the units or nests of tubes D. Two headers orchambers H are placed horizontally one above the other and connectedtogether by the large tubes F through which the units of tubes D passand secured to the outer plates A of the headers by coupling plates A ashereinbefore described. Stay tubes E expanded into the plates A of theheaders support them in position. Water tanks J may be connected withthe lower header through which the feed water passes.

Referring to Figs. 9 and 10 another special construction of boiler isshown for utilizing the units or nests of tubes D. Two chambers orheaders H are constructed connected by the large tubes F secured in theplates in any ordinary way. Through the headers or chambers H and thelarger tubes F the units or nests of small tubes D are passed andsecured as hereinbefore de scribed to the outer plates of the headers H.The headers H are connected to a steam and water tight chamber H placedabove them. The headers H may be vertical with horizontal tubes or theymay be horizontal with vertical tubes or at any other inclination.

In either of the special designs of boilers described the boiler mayrest upon steel tanks forming two or more sides of the furnace and thefeed water may be first injected into the tanks and from thence to theboilers by one or more tubes.

Referring to Figs. 11, 12 and 13 a special construction of locomotiveboiler is shown having horizontal and vertical tubes. The shell A ishorizontal and of oblong form. The shell is fitted in with units ornests of tubes D placed vertically and in the lire box are two headers Hwith units of tubes D placed horizontally passing through large tubes F.The units of tubes D are secured in position by coupling plates A ashereinbcfore described. The furnace P in this boiler is placed at oneend of shell and depending from the roof of furnace are the two headersH having tubes extending from the one to the other. The heat and gasesof combustion in these boilers, where the large tube system is used, bypassing through the stay tubes which are surrounded by water, andsurrounding the large tubes which contain water, and passing directlythrough the inclosed small tubes which are like the stay tubes alsosurrounded by water are presented to a large heating surface in acomparatively small space and very rapid evaporation is the result.

What we claim as our invention and desire to protect by Letters Patentis:-

1. In a steam boiler the combination with a unit comprising a pluralityof tubes of a dished coupling plate A at each end to which the tubes aresecured, a loose coupling ring B by which the coupling plate is drawninto position and a soft metallic ring C compressed between the twosubstantially described.

2. In a steam boiler the combination with a unit comprising a number oftubes D, of a dished coupling plate A at each end in which the ends ofthe tubes are secured provided with an internal screw thread, an annularnut B to engage the said screw to draw the coupling plate into positionand a soft inetallic packing ring C to form a oint between. the twoparts substantially as described.

In witness whereof, we have hereunto signed our names in the presence oftwo subscribing witnesses.

All'lllUll W. METCALFE.

.l OllN STEEL DIXON SlHNhS.

Witnesses JOHN Moons, THOMAS DIXON.

